the answer is -$97 for sure.
, f) l$ w, N( m L5 K" }* @Think about it this way ) p B" H8 L8 O3 k7 W) O
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)/ f5 |! h1 ], o) R9 ^' n
2) Now, the owner discovered that the 100 bucks is fake. You can think this as a lost of $100. therefore the overall gain is $3-$100 = -$97 |
發表於 2007-5-16 03:12 AM
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發表於 2007-5-19 03:21 PM
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發表於 2007-5-21 03:49 AM
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